Be Smart
What's The Loudest Possible Sound?
If a tree falls in the forest and no person is around, does it still make a sound? Students view a short video segment to determine sound and decibel levels of various objects, including the loudest and quietest possible sounds humans...
Be Smart
Why Do We Have To Sleep?
Humans are the only mammals who delay sleep. Viewers learn this and other interesting facts in a video that explores sleep in humans. The narrator also discusses how lights affect our sleep, the importance of sleep, and how sleep is...
Be Smart
Why Are Some People Left-Handed?
Most animals that show a paw preference are split 50/50 with half of the population preferring one side and the other half preferring the other, yet in humans only 10 percent are left-handed. The video explains what part of the brain...
MinuteEarth
Garbage Doesn't Lie
What does your garbage say about you? Young scientists dig through a video about things people cast aside. The narrator shows the fascinating things in George Washington's garbage pile, ancient Roman garbage, and how the landfills we...
Be Smart
How Some Words Get Forgetted
There's nothing regular about them—irregular verbs turn out to be the most common verbs in the English language. Through an analysis of data, learners discover that Zipf's Law describes the patterns of word usage.
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